Simplifying Ruby Code

Core Principle

Prefer simple data structures (Hash, Array, Struct, Data) and pure functions over unnecessary classes and abstractions.

MANDATORY: Identify whether code is a decision (pure logic) or effect (I/O). Keep them separate. See writing-code skill.

When to Use

• Command objects with single call method and no state
• Value objects that just wrap data without behavior
• Service classes that could be module functions
• Custom classes for simple data (coordinates, ranges, tuples)
• Deep inheritance where composition would work
• Missing Ruby protocols (to_h, to_a, each)
• Tests require extensive mocking (indicates mixed concerns)

Over-Engineering Patterns